Justified” implies a right-ness or wrong-ness. Rightly or wrongly, it was simply going to to happen, and in the ideological context of the 16th-19th century it made sense. The North American landscape was never static. read more
From the United States government point of view, Westward Expansion created more land for farmers and settlers, more natural resources for the United States, and built the United States into a major world power. read more
In today's terms, no, this expansion was not justified. We no longer think that it is acceptable for countries to take land from other countries simply because they are able to. But at the time that it was happening, there was definitely the idea that might made right. read more